@gaieus said:
Why not use a "generic" colour that is similar to the façade? If you colour some face, the Google folks may still not like it so when a colour is applied on a face, divide that face, right click on one half and "make unique". Now SU will create a raster image from the colour. Next step is to select both halves and "combine textures" (and delete dividing edge).
Very nice tip, Gai, thank you. Still need to buy you that beer!